import java.util.Scanner;

public class Test1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int num = in.nextInt();
            int[] hash = new int[10];
            int ret = 0;
            while (num > 0) {
                int tmp = num % 10;
                if (hash[tmp]++ == 0) {
                    ret = ret * 10 + tmp;
                }
                num /= 10;
            }
            System.out.println(ret);
        }
    }
}
